for a subtractor with sine wave

[deepu7]

*Analysis directives:
.AC DEC 1 0 20k
----------$
ERROR -- Invalid value
.PROBE V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*))
.INC "..\SCHEMATIC1.net"


pls reply as soon as possible for the above error

 

[albbg]

The directive ".AC DEC 1 0 20k" means you want to sweep by decades from 0 to 20kHz in just a single point !
You should specify a number of points greather than 2 (typically higher than 100)

 

[LvW]

In addition, you must not start at 0 Hz. Choose any frequency (0.001 Hz or even lower if you want) above 0 Hz as lower limit.